When I heard that Google Earth had been released for OS X the other day I had to give a spin. At first glance it looks sorta like a standalone client for their online maps service, albeit with many more layers you can overlay over the map and more UI special effects.
Dig around a bit more and you find there is a whole user community around finding and labeling places on the map. You enable these optional layers and you find a treasure trove of little details people have spent time entering in. For instance in my area I find free WI-FI access points labeled, traffic cam information, Bruce Lee’s Grave, Bill’s house, or where Kurt shot himself.
I was let down a little bit that it wouldn’t handle the address for my friend in Japan, but then again none of the map sites seem to do so…